The Justice Department is suing the company behind a widely used software that helps landlords set rental prices. It alleges that RealPage’s rent recommendation algorithm drives up prices and “deprives renters of the benefits of competition on apartment leasing terms.”

In the complaint, the DOJ, along with eight states, claim that RealPage obtains nonpublic rental price information from competing landlords who use the software. RealPage then allegedly feeds this information into its algorithmic pricing software, which landlords can use to get suggestions about their rent rates.

As alleged in the lawsuit, “these are more than just ‘recommendations,’” as RealPage also “reviews and weighs in on landlords’ other policies,” in which it attempts to end concessions and discounts for renters. Landlords can also “effectively agree to outsource their pricing function” to RealPage with an “auto accept” option that automatically adjusts their rents based on its algorithm.

“In a competitive marketplace, each landlord may independently decide to offer concessions so that it can better compete in enticing lessors,” the complaint alleges. “But, again, RealPage seeks to replace fully independent, competitive decision-making with collective action by ending concessions.”

Additionally, the DOJ claims RealPage maintains a monopoly in commercial revenue management software for multi-family dwellings, making up around 80 percent of market share. RealPage’s “unlawful agreements” with landlords and the sensitive data it receives from them give the company a competitive advantage, the lawsuit alleges. The Verge reached out to RealPage with a request for comment but didn’t immediately hear back.